一、思维导图

二、练习

#include <iostream>

using namespace std;

class Rect
{
    int width;
    int height;
public:
    void init(int w,int h)
    {
        width=w;
        height=h;
    }
    void set_w(int w)
    {
        width=w;
    }
    void set_h(int h)
    {
        height=h;
    }
    void show()
    {
        int per=2*(width+height);
        int area=width*height;
        cout << "周长为:" << per <<endl;
        cout << "面积为:" << area << endl;
    }
};
int main()
{
    Rect rect;
    int width,height;
    cout << "请输入宽:" ;
    cin >> width ;
    cout << "请输入高:" ;
    cin >> height ;
    rect.init(width,height);

    rect.show();
    return 0;
}